Two-Stage Variable Flow Poppet Valve for Low-Force Actuation
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Solution Overview
Problem
Existing fluid dispensing systems require significant user force to actuate valves due to upstream fluid pressure, and they typically offer only binary flow rates, lacking control over fluid flow rates.
Innovation Solution
A variable flow poppet valve design featuring an outer valve plug, bushing, inner valve plug, and cap, allowing for controlled actuation between fully closed, partially open, and fully open positions, with a lower spring rate first stage ensuring easier actuation and precise flow control through tapered surfaces and segmented passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional valve design is used, then the valve structure is simple, but the user must exert large force to overcome upstream fluid pressure to actuate the valve
Solution Approach 1:
The valve is divided into two independent stages: an inner valve plug with first stage seat and passage, and an outer valve plug with second stage seat and passage. Each stage can be actuated independently, allowing the user to open the first stage with minimal force while the second stage remains closed, thereby reducing the overall actuation force required compared to a single-stage valve where both stages must be overcome simultaneously.
Solution Approach 2:
The inner valve plug and its associated first stage components are nested within the outer valve plug structure. The inner valve plug is positioned inside the outer valve plug body, and the first stage passage is contained within the second stage passage. This nested arrangement allows sequential actuation where the inner stage can be opened first with less force, then the outer stage can be opened subsequently.
2Ease of operation
If a conventional binary valve is used, then the valve structure is simple, but the fluid flow rate cannot be controlled and only offers binary flow rates
Solution Approach 1:
The valve flow path is segmented into two independent controllable stages: the first stage controlled by the inner valve plug and first stage seat, and the second stage controlled by the outer valve plug and second stage seat. Each stage can be independently actuated to different degrees, enabling the user to select from multiple flow rate combinations (e.g., first stage only for low flow, second stage only for medium flow, both stages for high flow), thereby providing continuous flow rate control rather than binary options.
Solution Approach 2:
The valve transitions from a static binary state to a dynamic multi-state system where each stage can be independently positioned between fully closed and fully open. The inner and outer valve plugs can be actuated to different extents, creating variable flow areas at each stage, which enables continuous adjustment of the overall fluid flow rate through the valve.
Data Source
AI summary
A variable flow poppet valve includes a first stage, a second stage, a bushing disposed in the second stage, and a cap configured to actuate the valve open. The first stage includes an inner valve plug having a head with a first tapered portion and a shaft extending downstream from the head, and a first stage spring disposed within the bushing and extending around the shaft. The shaft is attached to the cap to allow the cap to actuate the inner valve plug to the open position. The second stage includes an outer valve plug having an upstream portion and a second tapered portion extending downstream from the upstream portion. The bushing includes a shoulder, and the cap is configured to engage the shoulder to actuate the outer valve plug to the open position.